Is clotrimazole safe during a pregnancy?

Yes, it is. There is good consensus by drug information references that clotrimazole is considered to be safe during pregnancy. It has been taken by a large number of pregnant women and women of childbearing age without any harm at all to the unborn child.
Yes second and third. In clinical trials, use of vaginally applied Clotrimazole in pregnant women in their second and third trimesters has not been associated with ill effects. There are, however, no adequate and well-controlled studies in pregnant women during the first trimester of pregnancy.